1. Maybe if eggs stayed in the lab until they were claimed and never went away, this might be useful. But after 10-15 minutes (I think) eggs do go away anyway.

2. Users could easily just adopt easy to hatch eggs and get lots, and lots, and lots of PD by hatching a bunch of eggs, even if it only would offer PD if the egg was in the Lab for maybe- 10 minutes at least.

No support from me. I have read some suggestions like this and a mod has always come back with a reply that there is currently a bug in the system that doesn't rotate the eggs out every 15 minutes like it should but once Riako (hope I spelt his name right) finds the bug and figures out a way to fix it then it should go away.